Foraminifera fi-om the Coast of Norway. 285 



rainifera met with in recent sea-sands. One of these, though 

 composed of a clear substance, has no apparent surface-foramina, 

 but only ornamental depressions*; the other is opake in its homo- 

 geneous, non-arenaceous substance, and is probably related to 

 the Miliol(E. Schultze has figured both the perforated hyaline 

 formf {Spirillina, Ehrenb.) and the opake shell J. He places both 

 in his new genus Cornuspira, which can only refer to the latter §. 



There are other more or less nearly allied forms, though pro- 

 bably distinct, both discoidal and irregular in the arrangement 

 of their whorls ; and some also not truly monothalamons, but 

 beginning at least with one, two, or more well-defined chambers. 



The Spirillina', Cornuspira, and their allies are excessively 

 common in the present seas and in a fossil state, and are usually 

 minute. They are frequent in the Tertiaries (for instance, 

 Grignon, Tours, Bordeaux, London Clay) ; also in the Chalk, 

 Lias, and Magnesian Limestone ||. 



7. Operculina complanata, Basterot, sp. PI. XL figs. 3, 4. 



Lenticulites complanata, Basterot, Mem. Geol. Bass. Bordeaux, p, 18. 

 Operculina complanata, D'Orb. Aun. ties Sci. Nat. vii. p. 281. no. 1. pi 14 



f. 7-10. 

 Planulina Ariminensis, D'Orb. ib. p, 280. pi. 14. f. 1-3, and Modeles, no. 4.9. 



The shell here figured is discoidal, flattened, and somewhat 

 square at the edges ; spire exposed ; chambers about nineteen, in 

 three whorls, slightly overlapping, subquadrate in side-view; 

 septa and edges thickened and elevated ; the outer margins of 

 the chambers melting into the marginal border of the shell ; 

 the inner margins irregularly thickened, and giving rise to coarse 

 granulations. Shell smooth, shining, hyaline, finely perforate ; 

 surface sometimes granulated about the central portion of each 

 surface, and along the edges of the septa and borders of the 

 chambers. 



This is an exact miniature of some of the younger specimens 

 of the large Operculince which we have from New Zealand^ and 

 from the Philippines**. It also closely resembles the fossil 

 Operculina of the Tertiary deposits, being sometimes granulated 



* Also fossil at Bordeaux. 



t Schultze, Organ. Polyth. pi. 2. f. 22. J Schultze, op. cit. pi. 2. f. 21. 



§ Some fossil forms of these planodiscoid Foraminifera have been de- 

 scribed and figured as Operculince by Reuss and Czjzek in Haidinger's 

 Abhandlungen and elsewhere (such as 0. cretacea, O. angiyyra, O. invol- 

 vens, 0. punctata, 0. striata, 0. plicata). 



II See Mr.T. R. Jones's observations on Spirillina in King's " Monograpli 

 of the Permian Fossils," Palajont. Soc. 1850, p. 18, and in Journ. Geol. 

 Soc. Dublin, vol. vii. part 2. p. 73. 



H Through the kindness of Mr. Woodward. 



** Communicated by Dr. Carpenter. 



